If, like me, you had a bunch of their unused cartridges left after the recall, you might consider one of iSi's stainless steel soda siphons. They make a 3/4 liter version and a liter version. Mine works quite well, esp. if I chill the water before I charge it, shake the siphon after charging, and then let it sit in the refrigerator for a while afterward before using it.